Calls for my boss, asks for him by name (the caller has a thick accent of some sort). I am my boss' call screener, so when I say, "may I take a message?", the caller responds, " I am calling for (some other name) and will call back when I can speak directly to (my boss)". I then say, "I answer the phone for my boss, so you will not get through to him. May I take a message?" Caller says, "No, I will try to call back". I get this a lot, with different numbers, but the same spiel. Now, I just say, "Please do not call again unless you are able to leave a detailed message with a phone number." Unfortunately, these calls come from different numbers, so I can block them, or report it... any advice?